Improvement in printing-telegraphs



2 Sheets--Sheet'l.

T. A. EDISON. Printi ng 'Telegraphs.

Patented July I, 1873.

mm 2 MW ATTY.

AM. Pnoro-umamPn/c c0. N.(aseamvs& mocsss) UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE GOLD AND STOCKTELEGRAPH COMPANY, OF NEW YORK, N. Y.

IMPROVEMENT IN PRlNTlNG-TELEGRAPHS.

Specification forming part of Letters Patent No. 140,487, dated July 1,1873 application filed February 18, 1873.

To all whom it may concern Be it known that I, THOMAS A. EDIsoN, ofNewark, in the county of Essex and State of New Jersey, have inventedImprovements in Printing-Telegraphs, of which the following is aspecification:

In this improvement the transmission is effected by pulsations through abreak-wheel, relay-magnet, and main line; and as the pulsation energizesthe relay-magnet it closes a local circuit to a type-wheel magnet thatacts upon pallets to rotate the type-wheel and the break-wheel, and inso doing breaks the mainline circuit, and allows the main line to breakthe local, and the spring of the type-wheel armature to draw the latterback, and by the pallets move the type-wheel and break-wheel aroundfurther, and reclose the main circuit, and repeat the operations beforedescribed. These connections are resorted to to prevent too rapidmovement. The main-line pulsations act in all the instruments of theline to set the type-wheels through the local circuits. Thetransmitting-instrument is stopped at a point when both circuits arebroken, and in each receiving-instrument the pallet-lever, being drawnback by a spring, closes a local circuit to a magnet that operates theprintingcircuit and energizes the printing-magnet.

In the drawing, Figure 1 is a plan representing portions of theinstrument and the circuit-connections, and Fig. 2 is a side view ofpart of the instrument.

The type-wheel a is upon a shaft, 1), that has a pallet-wheel, c,operated by a pallet-lever, d, the armature e of which is moved by themagnet f, that is in the circuit 2 2, from the battery g. A break-wheel,h, upon the shaftb, and a contact-spring, k, of suitable construction,are in the circuit 3 from the battery I, in which circuit is therelay-magnet m, the lever n of which opens and closes the circuit 2.

The operation of these parts is, that when m is energized the lever 12closes the circuit2; this energizes the type-wheel magnets f, and by thepallet-lever d the type-wheel is moved half a space. This at thetransmitting-instrument breaks the circuit 3 by one of the nonconductingsegments of the wheel h coming under the end ofk. The circuit 3 beingbroken, the lever it falls back, breaking the circuit 2, and the magnetsm f, discharging, allow the spring 4 to draw back the pallet-lever d,moving the break-wheel h far enough to close the circuit 3 again, andthe operations are repeated, thus producing an automatic opening andclosing of the circuits 2 and 3, and the speed of movement can beregulated by the tension of the armature-springs.

If the circuit 3 is the main line, then the circuit 2 will be local atthe transmitting and receiving stations; but if the circuit 3 is localthe circuit 2 may be the main line, and the circuit 3 will not be in usewhile receiving.

If a finger-key is depressed the arm 1 upon the shaft b is arrested bythe lever t of the fingerkey 8, (a few only of these keys are shown, butthey are of usual character,) and the parts are in the position shown;but both circuits 2 and 3 are broken, and the spring a closes thecircuit 8 from the battery 9 to the local magnet q, the armature-lever pof which closes the print-in g circuit 10, that passes through theprinting-lever magnets 20, so that apause at the transmitting-iustrumentallows time for the energizing of the respective magnets w and theprinting of the letter by the levers 00.

The printing may be etfected with one local circuit, if the spring toforms part of the circuit 10; and in cases where these instruments areused with two line-wires the line-wire forms part of the circuit 10 tothe printing-magnet of the distant instrument or instruments. As thefinger-key is raised the spring 4 draws the pallet-lever d, and turnsthe wheel h sufficiently to close the circuit 3, and the pulsations are,set up as before. The time that the spring a is in contact with thecircuit-screw 14 is momentary, except when there is a pause bydepressing one of the keys; hence the printingmagnets will only beenergized at that time.

I claim as my invention- 1. The combination of the type-wheel,pallet-wheel, circuit-Wheel h, and pallets with the circuits 2 and 3 andelectro-magnets m and f,

substantially as set forth for automatically circuit when the finger-keyis released, sucopening and closing the respective circuits stantiallyas set forth.

and rotating the type-wheels, as set forth. Signed. by me this 13th dayof February, A.

2. The printing-circuit closed by the spring D. 1873.

u of the pallet-lever when the circuits 2 and 3 THOMAS A. EDISON.

are broken, and the movement of the type- Wheel arrested by thedepression of a finger- Witnesses:

key, in combination with the pallets that are GEO.'T. PINOKNEY,

moved by the spring and close the type-wheel OHAs. E. SMITH.

